as some of you know i just went through a rebuild with my 93 z28 where i went .060 bore, 0.010 rod and 0.010 main

well to get to the point, it starts fine, i put it in reverse, it goes then as soon as i put it in drive the car stalls out and dies. the only way i can get it to start is to mash the pedal to the floor and sometimes it still just chokes up and dies.

and i got the code 43......

any info that would help me would be greatly appreciated!

EDIT: it also idles at about 400-800 rpms

 

Based on the 3 major points you mentioned, it appears you may have 2 problems. By far however, the worst is the KS circuit problem. The 43 indicates you have a problem were the PCM can't detect the KS. It will then severely retard timing to try to protect the engine since it can no longer monitor engine knock. This can account for the low idle and it certainly will fall on it's face. Whether it's enough to cause your stalling problem is unclear.

Since you have to floor it to restart it, it would appear you are running a bit too rich. By flooring the throttle you put it into flood mode. First work on getting the KS circuit back together and see what effect it has. Then proceed to find the cause of the rich running condition if it still exists at that point.

 

Did this rebuild include a cam, and are you a stock stalled auto? Has the car got a tune for your new mods?

 

no cam, its auto, and yeah i got a pcmforless tune for it

 

Well that rules out alot of stuff, do what speedy said and get rid of the ks code and see how it is then.

 

where should i start?? i have no idea what tlo do.....

 

First you want to check the KS to see that it is functioning properly. Then you want to confirm with an ohm meter that the wiring is intact from the KS to the connector at the PCM. However, none of us have a diagram for the 93. You'll obviously have to find one.